US Bridges

I-75 Ramp a & C over Swartz Creek

Fair

Genesee County, Michigan · SB I-75 Rmp to I-69 · Structure no. 000000000002519

Built
1969
56 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
128 ft
3 main spans
Daily traffic
11,275
2013 count
Owner
State
State Highway Agency

About this bridge

I-75 Ramp a & C over Swartz Creek is a prestressed concrete stringer/multi-beam or girder carrying I-75 Ramp a & C over Swartz Creek in Genesee County, Michigan. It was built in 1969, so it is 56 years old, older than the Michigan average of 48.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 11,275 vehicles a day, roughly 9% of them trucks, projected to reach 12,450 by 2020. The structure is 128 ft (39 m) long and 44 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesI-75 Ramp a & C
CrossesSwartz Creek
LocationSB I-75 Rmp to I-69
RouteInterstate 75
CountyGenesee County
StateMichigan
Coordinates42.98733, -83.73769
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating77.8 US tons
Inventory rating46.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length128 ft (39 m)
Longest span43 ft (13.1 m)
Deck width44 ft (13.3 m)
Roadway width41 ft (12.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,275 (2013)
Projected traffic12,450 by 2020
Trucks9%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was I-75 Ramp a & C over Swartz Creek built?

It was built in 1969, making it 56 years old in 2025.

What condition is I-75 Ramp a & C over Swartz Creek in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in October 2024.

How much traffic does I-75 Ramp a & C over Swartz Creek carry?

About 11,275 vehicles per day (2013 count), of which roughly 9% are trucks.

How long is I-75 Ramp a & C over Swartz Creek?

The structure is 128 ft (39 m) long with a longest span of 43 ft (13.1 m) and a deck 44 ft wide.

Who owns I-75 Ramp a & C over Swartz Creek?

It is owned by the State Highway Agency.